The Genuine HP 21 (C9351AN) Black Ink Cartridge is a brand new, sealed product that is expired as of 04/2019. It is specifically designed for use with HP printers, with compatibility for models such as the HP Officejet Pro 8600. The black ink cartridge utilizes inkjet, pigment, and thermal print technology, ensuring high-quality prints with crisp and legible text. As a genuine HP product, you can trust in its reliability and performance for all your printing needs.